Around 6 hours 25 minutes to beat. I spent 6 hours and 7 minutes on the final stage alone. Only maybe the final 2 stages penalise you for death and make you restart the stage after lives are exhausted. I switched to a Seimitsu 62 joystick for the last few hours and felt much more accuracy. Swapped the stick out on the Hori RAP4 controller, so that this stick specialises more for shooters. That seems like a more responsive stick for shooters. Normally I use a pad but was experimenting. I completed the Playstation port in 37 minutes after beating this. That port seems much more responsive. I was using a Hayabusa stick previously which is much looser and seems better suited for fighting games. I believe this Saturn emulator may have extra input lag which made things alot harder. I will post a tutorial with commentary soon, focusing on the final stage.
Edited out lost continues on the stages that penalise you for losing continues (Make you restart the stage). The game doesnt do that until the end. I show the continue screen for those edits to make it clear. This game has unlimited continues.